Ludwig hirt



Patented May l6, I899.

No. 625,03l.

L. HIRT. GBYSTALLIZING APPARATUS.

(Apphcahon filed June 16, 1898 (No Model.)

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NlTED STATES ATENT. rri

LUDl/VIG HIRT, OF GREVENBROIOH, GERMANY, ASSIGNOR TO THE MASOHINENFABRIK GREVENBROICH, SAME PLACE.

CRYSTALLIZJNG APPARATUS.

SPECIFICATION forming part of Letters Patent No. 625,031, dated May 16, 1899.

Application filed June 16, 1898.

forth in the United States Patent to Ludwig Wulff, No. 528,497, dated October 30, 1894. By my invention the stirrers are preferably 7 of such construction that while theyact in the two halves of the cylindrical vessel in opposite directions they thoroughly mix the masse-cuite under treatment and keep it in constant motion while crystallization is going on. They will prevent any crystallized matter from settling on the side walls or heads of said vessel. Furthermore, the stirrers may be easily separately removed from the axle and replaced by others, as will readily be seen by the following description. The device for admitting heating or cooling medium into the space of the double casing'very much simplifies the connection of such parts with the outer shell of said vessel. 3

In the accompanying drawings I have shown one form of apparatus embodying my invention.

Figure 1 is a longitudinal section through the crystallizing vessel. Fig. 2 is a transverse sectional view of the apparatus, taken on the line m 00 of Fig. 1. Fig. 3 is a detail end view of the valve mechanism.

The apparatus shown in the drawings consists mainly of a cylindrical horizontal vessel A, closed at both ends by the heads X X. The cylindrical vessel is provided with a jacket 13 for allowing heating or cooling medium to circulate around the vessel. This medium may be employed either in a gaseous or liquid state. dium to enter into the jacket a device 0 is arranged at one end of the jacket and at the lower side thereof. This device consists of For allowing the said me- Serial No. 683,596. (No model.)

I a l -shaped pipe a, Fig. 8, at each end of which a valve 19 and b is arranged for admitting either the heating means or the cooling means. The outlet D at the opposite and upper end ofthe jacket allows the heating or cooling medium to escape. An aperture E at the upper side of the jacket is arranged for introducing the masse-cuite or other solution to be treated in the vessel, and another aperture F is arranged for inspecting the vessel inside, serving as a manhole and also for introducing crystals, if this becomes necessary for the process in hand. Both apertures E and F may be closed tightly by covers, and they are separated from the hollow space of the jacket by-suitable means. At the lower side of the jacket an outlet G, provided with a slide or valve, isarranged for permitting.

the crystallized mass to be evacuated from the vessel. The cover 0 of this outlet is arranged so as to close the vessel and prevent settlement of crystallized matter in the space below the wall of the vessel A.

The vessel A is shown as provided with stirrers of peculiar construction. The shaft H of these stirrers passes through the headsXX by means of stuffing-boxes S S and is rotated by means of a worm wheel J and a worm K, on the shaft of which latter the pulley R is fixed. The worm K may be partly situated I within a troughe, so as to be lubricated bya lubricant within said trough, in order to reduce the friction as much as possible. v

Within the crystallizationvessel the shaft H is preferably of asquare cross-section, and on this square part the stirring device is mounted. The stirring-blades f f f f f fl f are fixed on the shaft H and carry at their ends a flat iron bar g, bent into a helicoidal line reaching nearly to the inner wall of the crystallizing vessel in order to avoid any settling of crystallizing mass. In order to thoroughly stir the mass, a second flat iron bar g of a helicoidal shape is arranged in the middle of the stirring-blades, or several of such helicoidal bars g, at proper distances from each other, may be fixed to the blades. The

blades f f f &c., are bent in their length wise direction according to the helicoidal form of these fiat iron bars 9 g.

In order that no crystals may settle on the heads of the vessel, scrapers h 72 are arranged at the opposite ends of the stirrers, which scrapers remove all deposits on the heads of the vessel.

In order that the stirrer device within the vessel may be very rigid, stays 2' may be arranged at proper places.

v The fixing of the blades on the shaft is effected by bending the blades at their innermost ends into saddles m, preferably of a -shaped form, as shown in Fig. 2. These saddles are set onto the square shaft and conform in shape thereto and are held in this position by counter-plates n and screws 0 0. Beyond this fixture the blades f are bent according to the helicoidal line of the flat bars 9, to which the blades are fixed by means of screws or rivets. The helicoidal form of the flat bars and the position of the blades corresponding to that form may be of a more or less rising gradient, according to the character or condition of the masse-cuite. The gradient shownin the drawings is about fiftythree degrees on each side. The stirrers in the two halves of the apparatus are placed in alternate position of one hundred and eighty degrees and are so placed that the mass on the left hand is removed towardthe right and that on the right hand toward the left.

Having described one form or embodiment of my invention and the mode of operation thereof, I declare that whatI claim, and desire mitting cooling or heating means into said jacket, a manhole in the jacket and vessel, a central shaft of rectangular cross-section, blades provided with saddles m embracing and conforming to the shape of the shaft, counter-plates and screws for fixing said v blades to the shaft and helicoidal-shaped fiat iron bars, to which said blades are fixed.

2. In an apparatus for crystallizing purposes, the combination of a central shaft of rectangular cross-section, blades provided with saddles m embracing and conforming to the shape of the shaft, counter-plates and screws cooperating with the saddles'to fix each blade separately to the shaft and a flat iron poses the combination of a central rectangu:

lar shaft, blades provided with saddles 'm on their ends embracing the shaft, counterplates, and screws to secure the saddles and blades in place on the said shaft, helicoidal fiat bars fixed to the said blades and stays for rigidly connecting the blades with the said shaft. I g

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 23d day of May, 1898.

LUDVVIG IIIRT.

Witnesses:

CARL KNooP, HERNANDO DE So'ro. 

